Another month, another electric bill… and I’m sitting there doing the mental gymnastics: was it the kids leaving stuff on, my PC, the pool pump, the mini split, or the EV? The problem is your utility bill is basically a grocery receipt that only shows the total. In this video I install the Refoss EM16 Pro so I can stop guessing and actually see where every watt is going—by breaker—both in the Refoss app and directly inside Home Assistant. I walk through what comes in the box, how the clamp-style current transformers work, and what the install is really like. Real talk: if you don’t know what you’re doing in a panel, hire a licensed electrician—this can be dangerous. Once it’s in, the fun part starts: naming circuits, fixing “negative” readings by flipping the circuit factor in the app, merging mains into “full house power,” and then pulling everything into Home Assistant (including the option to disable the cloud so it’s local-only). The big takeaway? Data changes everything. In my house, the mini split absolutely shocked me—it was chewing up almost a third of our energy in the period I checked, and it made my Tesla look like a tiny sliver. That’s the kind of insight you can actually act on to save real money.